Answers for "Understanding heightmap RAW imports"http://answers.unity.com/questions/1593732/understanding-heightmap-raw-imports.html
The latest answers for the question "Understanding heightmap RAW imports"Answer by kaarloewhttp://answers.unity.com/answers/1593796/view.html
RAW and PNG are different things. And file extensions are mostly for just people (actual code usually reads FourCC to determine the format of file).
Maybe https://unity3d.college/2017/07/17/importing-real-world-terrain-unity-free-terrain-party/ maybe that one helps with your project
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AFAIK Unity doesn't support PNG files that have more that 8 bits per channel.
https://forum.unity.com/threads/16-bit-png-shows-considerable-banding.527522/Thu, 24 Jan 2019 07:41:45 GMTkaarloew